.. This document is auto-generated by the altair-gallery extension. Do not modify directly.

.. _gallery_ranged_dot_plot:


Ranged Dot Plot
-----------------
This example shows a ranged dot plot that uses 'layer' to convey changing life expectancy for the five most populous countries (between 1955 and 2000).


.. altair-plot::
    :code-below:

    
    import altair as alt
    from vega_datasets import data

    source = data.countries.url

    chart = alt.layer(
        data=source
    ).transform_filter(
        filter={"field": 'country',
                "oneOf": ["China", "India", "United States", "Indonesia", "Brazil"]}
    ).transform_filter(
        filter={'field': 'year',
                "oneOf": [1955, 2000]}
    )

    chart += alt.Chart().mark_line(color='#db646f').encode(
        x='life_expect:Q',
        y='country:N',
        detail='country:N'
    )
    # Add points for life expectancy in 1955 & 2000
    chart += alt.Chart().mark_point(
        size=100,
        opacity=1,
        filled=True
    ).encode(
        x='life_expect:Q',
        y='country:N',
        color=alt.Color('year:O',
            scale=alt.Scale(
                domain=['1955', '2000'],
                range=['#e6959c', '#911a24']
            )
        )
    ).interactive()

    chart


.. toctree::
   :hidden: